The resurrection is the keystone of the arch on which our faith is supported. If Christ has not risen, we must impeach all those witnesses for lying. If Christ has not risen, we have no proof that the crucifixion of Jesus differed from that of the two thieves who suffered with him. If Christ has not risen, it is impossible to believe his atoning death was accepted.
We have got nowadays so that we divide lies into white lies and black lies, society lies and business lies, etc. The Word of God knows no such letting-down of the standard.
Lying covers a multitude of sins - temporarily.